#  positional parameters
def add_two(a,b):
	return a+b
print("""
def add_two(a=1,b=0):
	return a+b
""")	
print(f"add_two(1,4): {add_two(1,4)}")
print(f"add_two(a=1,b=4): {add_two(a=1,b=4)}")
print(f"add_two(-1,40): {add_two(-1,40)}")

def add_two_with_default(a=1,b=2):
	return a+b
print("""
def add_two_with_default(a=1,b=2):
	return a+b
""")	
print(f"add_two_with_default(1,4): {add_two_with_default(1,4)}")
print(f"add_two_with_default(a=1,b=4): {add_two_with_default(a=1,b=4)}")
print(f"add_two_with_default(-1,40): {add_two_with_default(-1,40)}")
print(f"add_two_with_default(8): {add_two_with_default(8)}")
print(f"add_two_with_default(b=1): {add_two_with_default(b=1)}")
print(f"add_two_with_default(): {add_two_with_default()}")

#   Positional parameters and keyworded (named) parameters.
#       A parameter has a position and a name.
def introduce(name, age):
    print(f"My name is {name} and I am {age} years old.")
    return 'done'
    
print("""
def introduce(name, age):
    print(f"My name is {name} and I am {age} years old.")
    return 'done'
""")

print(f"introduce('Jane', 19): {introduce('Jane', 19)}")
print(f"introduce(19,'Jane'): {introduce(19,'Jane')}")
print(f"introduce(name='Jane', age=19): {introduce(name='Jane', age=19)}")
print(f"introduce(age=19,name='Jane'): {introduce(age=19,name='Jane')}")